A common surface antigen in influenza viruses from human and avian sources.
D000941:Antigens / Q000032:analysis*; D003168:Complement Fixation Tests; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D009439:Neuraminidase / Q000032:analysis*; D009975:Orthomyxoviridae / Q000276:immunology*; D013045:Species Specificity
D000941:Antigens; D009439:Neuraminidase